Anthropic is reportedly in the advanced stages of raising a further US$2 billion, which would value the artificial intelligence startup at US$60 billion.
According to the Wall Street Journal, Lightspeed Venture Partners was leading the funding round with the valuation including the funds Anthropic planned to raise.
Anthropic, which was set up in 2021, had been valued at US$18 billion last year following another fundraising round.
Amazon.com Inc (NASDAQ:AMZN) is among its main backers, having committed US$8 billion worth of investment since 2023.
The latest round would leave Anthropic as the fifth-most valuable startup in the US, behind SpaceX, OpenAI, Stripe and Databricks.
Anthropic had been set up by ex-employees of ChatGPT-maker OpenAI and has developed a chatbot known as Claude.
Annualised revenue recently amounted to US$875 million, largely on the back of sales to businesses, Wall Street Journal-cited sources said.
The start-up’s latest funding round follows a spate of dealmaking across the AI sector after OpenAI almost doubled its valuation to US$157 billion through a US$6.6 billion raise in October.